第25题: [单项选择]What is the main theme of the passage A. The decline of fresco painting. B. The predominance of oils over watercolor. C. The rediscovery of watercolor in England. D. The origins and development of watercolor. 参考答案:D 答案解析:[注释] 本文主要谈论的是水彩画的起源和发展过程;其余三项均为次要信息。